untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms of untreated

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

Stronger, tougher plastic For the study, the team compared plastics containing untreated, flash-heated and chemically modified biochar along with a nonlayered version. — Georgina Jedikovska, Interesting Engineering, 8 Oct. 2026

Bubonic plague will often advance and turn into the other two forms of plague if untreated. — ABC News, 7 Oct. 2026

Life insurers called it ‘untreated cancer,’ STAT Are federal disability rights at risk? — Theresa Gaffney, STAT, 7 Oct. 2026

Pneumonic plague’s mortality rate is almost 100 percent if untreated, but chances of survival are higher with rapid treatment. — Claire Maldarelli, Scientific American, 7 Oct. 2026

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease